SEPARATION MEMBRANE

• Main Authors: NISHIGUCHI YOSHIKI, YAMAMOTO NAOKI, OGATA MASAMI, TAKAYA KIYOHIKO
• Format: Patent
• Language: English; Japanese
• Published: 13.10.2023
• Subjects: PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; TRANSPORTING

To provide a separation membrane which maintains practical water permeability, has high removability of hardness components, particularly bivalent ions, and also has high removability of neutral molecules such as polysaccharides.SOLUTION: A separation membrane includes a dense layer and a macro-void layer and also first and second surfaces. The dense layer and the macro-void layer contain the same nonionic high polymer as a main constituent. The dense layer surface is the first surface, and in the first surface, an aperture rate is 5% or less, and an average aperture diameter is 0.3 nm to 3.0 nm. In the macro-void layer, the minor axis of an approximate ellipse is 15 μm or more, and an angle formed by the major axis and a direction parallel to the first surface is 80° to 100°. A ratio of the major axis to the minor axis is 4 or more in the macro-void.SELECTED DRAWING: Figure 1 【課題】本発明は、実用的な透水性を保持し、硬度成分、特に２価イオンの高除去性を有すると共に、多糖等の中性分子の高除去性も有する分離膜を提供する。【解決手段】本発明の分離膜は、緻密層とマクロボイド層とを有すると共に第1および第２面を有し、緻密層およびマクロボイド層は同一の非イオン性高分子を主成分として含有し、緻密層表面が前記第１面であり、前記第１面において、開孔率は５％以下であり、平均孔径は０．３ｎｍ以上３．０ｎｍ以下であり、マクロボイド層は、近似楕円の短径が１５μm以上であり、長軸が前記第1面と平行な方向との間に成す角度が８０°以上１００°以下であり、長径と短径との比が４以上であるマクロボイドを有する。【選択図】図１